United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 377
a basebaring an opening, a mold-seat surroundingsaid opening and a wall rising from said baseand comprising inner and outer members separated by material which is a poor con-ductor of heat, substantially as set forth. Tins specification signed and witnessedthis 12th day of September, 1905. DAVID A.… … FIG 4
Phonograph · Patents
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